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June l5 1926.

1,588,467 A. M. PRUITT swmcn Filed May 1. 1922 2 sheets-sheet 1 ffy-z /7rI? tm WITNSSES ATTORNEY June 15 1926.

WITNESSIS A. M. PRUITT swl'rcH Filed Mayv 1 1922 2 Sheets-Sheet 2 lNVENTOR ATTORNEY Patented June 15, 1926.

UNITED STATES AUGUST MARSHALL PRUITT, OF CLEVELAND, OHIO.

SWITCH.

AppIcaton filed May 1,

This invention relates to burglar alarms, which includes a circuitcloser adapted to be associated with a window sash, so that incident tothe movement of eitlier the upper or lower sash, the circuit is closedto sound the alarm whichA can be arranged at any desired location aboutthe buildi The nature and advantages of the invention will be betterunderstood when the following detailed description is read in connection with the accompanying drawings, the invention residing in theconstruction, combination, and arrangen'ient of parts claimed.

In the drawings forming part of this application, like numerals ot'reference indicate similar parts in the several views, and whereinFigure 1 is a fragmentary view of a window showing the circuit closerassociated therewi th'.

Figure 2 is a sectional view taken on line of Figure 1.

Figure o is an enlarged fragmentary view of the.` circuit closer removedfrom the window and showing the normal positionI of the parts.

Figure 4: is a sectional view taken on line 1-4 of Figure 3.

Figure 5 is a detail view of the liXed contacts.

Figure 6 is a detail view of one of the movable contacts.

Figure 7 is a detail view of the resilient finger.

Figure 8 is a detail view of the semi-disk like member.

Referring to the drawings in detail, A and B indicate respectively, theupper and lower sashes of a window of well-known construction, and thecircuit closer forming the subject matter of the present inventionindicated generally at C is arranged upon the top of the lower sash B.

rPhe. alarm (not shown) maybe arranged at any desired location about thebuilding and connected in circuit, so that incident to the raising orlowering of either sash, the circuit is closed'to sound the alarm.

The circuit closer includes a metallic casing 10, and is provided withan aperturcd lug 11, through which a suitable fastening element 12 ispassed in order to secure the casing 10 upon the top of the lower sashas illustrated in Figures 1 and 2. .Secured to one side of the casing isa piece of insulatA 1922. Serial N0, 557,585.

ing material 13 upon which is mounted a pair of movable contacts 14,each being of a resilient nature, andy curved in a manner shown tooperate in the grooves 15 of the window casing. are fixed Contact strips17 and it is of course understood that the movable contacts 15 slideover the contacts 17. One of the movable contacts is grounded to thecasing. 'The other contact 1l is provided with a bit ling post to whichis secured a conduct-irre; wire 20, the latter being ext-ended to thebinding post 21 at the opposite side of the casing and mounted upon apiece of insulaing material Also supported by the bindin post 21 is aresilient contact linwhich is of substantially L-shaped 2mation andarranged to operate within the casing This r ilient contact finger isnormally isnlated from the casing, and the circuit of course not closedor completed until m ved into contacting engagement with the casing.Arranged tol slide through opposed walls of the casing is a springpressed plunger or rod 25, which is bifur@ cated at one end as at 26,and pivoted between the separated portions defined by said bifurcation,is a semi-disk like member 28 which has a flat side or face 29.

Aiso carried by the plunger is a rod 30 which operates within the casingthrough an opening 31 in one wall thereof. This red is provided with anoffset extremity 32 which is aperturcd to receive the plunger, and heldassociated therewith by suitable lock nuts 35. The rod is disposed toengage the contact linger and move the latter into contact with thecasing in order to close the circuit incident to the movement of eithersash as above described. Slidable upon the plunger is a collar 3G whichmay be held 'tixed'to the plunger in any given position by means of acotter pin or the like 37, and this collar is utilized to regulate thetension of the spring 39. Also sur/rounding the plunger rod is a sleeve22', and this sleeve protects the threads of the plunger rod as will bereadily understood. The sleeve is provided at one end with a hexagonflange 23 which forms one' of the lock nuts, thereby protecting thethreads and acting as a movable bearing operating in the openingprovided for the plunger rod.

In practice, the casing is mounted upon the upper part of the lower sashB, with they semi-disk like member arranged vertically Secured in thesegrooves Q Les and With its curved edge contacting the Window asillustrated in Figures l and 2. lt is of course understood that when theparts are in this position, the plunger is placed under tension of thespring 39, and consequently, When either sash is moved, the semi-disklike member is forced to turn about its pivot until the flat edge isbrought into confronting relation with the glass, position which allowsthe plunger to move in a direction of the pane under the influence ofthe spring. Incident to this movement, of the plunger, the rod 3() movesin the same direction, engaging the finger 23, moving the latter intocontact With the casing, and thereby closing the circuit. As abovestated, the current passes through one oi' the movable contacts la, andfrom the binding post thereof through the conducting Wire through thebinding post 19, through the finger 23 and the casing lO. rllhe iingeris normally insulated from the casing, and consequently, the signalcannot be sounded until this finger is moved into contact With thecasing.

While it is believed that from the foregoing description, the nature andadvantages of the invention will be readily apparent', desire to have itunderstood that do not limit myself to what is herein shown anddescribed, and that such changes may be resorted to When desired as tallwithin the scope of What is claimed.

That lf claim is l. A circuit closer Comprising a 'frame included in anormally open circuit, and constituting a iXed contact, a. plungerslidably mounted on said frame and having one end bifurcated, a coilspring encircling the azi-ev plunger and bearing against the trame, acollar carried by the plunger and with which one ene of the spring isengaged, a movable Contact adapted to be moved into engagement with thehxed contact upon movement of the plunger in one direction, asemi-circular element pivotally mounted in the bi- ;turcated end o1 theplunger, and adapted to have its rounded edge normally set in engagementwith an object to hold said mov- 'able contact spaced from the 'fixedContact,

said element being moved upon its pivot ith the change of the relativepositions of said object and element, thereby allowing the plunger tomove under the influence oi' the spring to close the circuit.

2. Ac circuit closer comprising a frame included in a normally opencircuit, and constituting a iizred contact, a plunger slidably mountedon the trame and having one end biturcated, yieldable means associatedwith the plunger for moving the latter in one direction, a movablecontact arranged to be operated by the plunger and moved thereby intoengagement with the fixed Contact, a semi-circular elem-ent pivoted inthe bifurcated end or the plunger and having its rounded edge adapted tobe set in engagement with an objectto hold the plunger retracted, andpermitting movement of the plunger by said yieldable means, When thestraight edge is arranged to contact said object incident to the changeorp the relative positions of said object and element, an L- shapedmember carried by the plunger and having one branch disposed to engageand operate said movable Contact as described.

In testimony vvhereoiC I aiiiX my signature.

ane-ner Manet-mim rnnrrr,

